The answer should be B idk really
3/5 is greater because the decimal is .6 while 21/40 is .525
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The labeled point means the Amelia biked 1.5 30 miles in 1.5 hours.
This means that in 1 hour, Amelia biked 20 miles.
Her distance changed at a unit rate of 20 miles per hour, so that was her speed.